Effects of light refraction on the accuracy of camera calibration and reconstruction in underwater motion analysis.
One of the most serious obstacles to accurate quantification of the underwater motion of a swimmer's body is image deformation caused by refraction. Refraction occurs at the water-air interface plane (glass) owing to the density difference. Camera calibration-reconstruction algorithms commonly used...
| Publicado en: | Sports Biomechanics Vol. 5; no. 2; pp. 315 - 341 |
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| Autores principales: | , |
| Formato: | equations & formulas review tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Jul2006
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105932742&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105932742 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14763141 I7F jtl: Sports Biomechanics issn: 14763141 maglogo: N pubinfo: dt: Jul2006 vid: 5 iid: 2 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 105932742 2009309122 10.1080/14763140608522881 NLM16939159 105932742 ppf: 315 ppct: 26 formats: tig: atl: Effects of light refraction on the accuracy of camera calibration and reconstruction in underwater motion analysis. aug: au: Kwon Y Casebolt JB affil: Biomechanics Laboratory, Texas Woman's University, Denton, USA. sug: subj: Algorithms Calibration Equipment Reliability Light Motion Analysis Systems Refractometry Swimming Water ab: One of the most serious obstacles to accurate quantification of the underwater motion of a swimmer's body is image deformation caused by refraction. Refraction occurs at the water-air interface plane (glass) owing to the density difference. Camera calibration-reconstruction algorithms commonly used in aquatic research do not have the capability to correct this refraction-induced nonlinear image deformation and produce large reconstruction errors. The aim of this paper is to provide a thorough review of: the nature of the refraction-induced image deformation and its behaviour in underwater object-space plane reconstruction; the intrinsic shortcomings of the Direct Linear Transformation (DLT) method in underwater motion analysis; experimental conditions that interact with refraction; and alternative algorithms and strategies that can be used to improve the calibration-reconstruction accuracy. Although it is impossible to remove the refraction error completely in conventional camera calibration-reconstruction methods, it is possible to improve the accuracy to some extent by manipulating experimental conditions or calibration frame characteristics. Alternative algorithms, such as the localized DLT and the double-plane method are also available for error reduction. The ultimate solution for the refraction problem is to develop underwater camera calibration and reconstruction algorithms that have the capability to correct refraction. pubtype: Academic Journal doctype: equations & formulas review tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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